import { isNull, isUndefined } from 'lodash';

export function transListToTreeData (list, rootVal) {
    var arr = [];
    list.forEach(item => {
        if (item.parentId === rootVal) {
            arr.push(item);
            const child = transListToTreeData(list, item.id);
            if (child.length) {
                arr.children = child;
            }
        }
    });
}

export function parseTime (time, cFormat) {
    if (arguments.length === 0 || !time) {
        return null;
    }
    const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}';
    let date;
    if (typeof time === 'object') {
        date = time;
    } else {
        if ((typeof time === 'string')) {
            if ((/^[0-9]+$/.test(time))) {
                // support "1548221490638"
                time = parseInt(time);
            } else {
                // support safari
                // https://stackoverflow.com/questions/4310953/invalid-date-in-safari
                time = time.replace(new RegExp(/-/gm), '/');
            }
        }

        if ((typeof time === 'number') && (time.toString().length === 10)) {
            time = time * 1000;
        }
        date = new Date(time);
    }
    const formatObj = {
        y: date.getFullYear(),
        m: date.getMonth() + 1,
        d: date.getDate(),
        h: date.getHours(),
        i: date.getMinutes(),
        s: date.getSeconds(),
        a: date.getDay(),
    };
    const timeStr = format.replace(/{([ymdhisa])+}/g, (result, key) => {
        const value = formatObj[key];
        // Note: getDay() returns 0 on Sunday
        if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value] }
        return value.toString().padStart(2, '0');
    });
    return timeStr;
}

export function isNullOrUndefined (val) {
    return [isNull, isUndefined].some(fn => fn(val)); 
}
